Materials Literature
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Adenylosuccinate lyase of Bacillus subtilis is inactivated by 25-400 microM 6-(4-bromo-2,3-dioxobutyl)thioadenosine 5'-monophosphate (6-BDB-TAMP) at pH 7.0 and 25 degrees C. The initial inactivation rate constant exhibits nonlinear dependence on the concentration of 6-BDB-TAMP, implying there is reversible formation o…
A series of bis(ether anhydride)s has been synthesized from very bulky bisphenols. Poly(ether imide)s have been synthesized from these bis(ether anhydride)s and two diamines in order to provide a series of poly(ether imide)s with bulky main-chain units. The polymers have been characterized in terms of molecular weight…
Abstract Room temperature (300 K) experiments have earlier established that the replacement of a fluorine atom in p ‐difluorobenzene (pDFB) with a methyl group to make p ‐fluorotoluene (pFT) generates a qualitative difference in intramolecular vibrational redistribution (IVR) characteristics as seen in the S 1 states.…
The Gilbert equation of motion is solved for magnetic nano-elements of arbitrary shape using a hybrid finite element/boundary element method. NiFe elements show small scale domains in the remanent state, if a uniaxial anisotropy parallel to the short axis is assumed. In bars with one pointed end, the formation of the…
Solid-state 125Te NMR studies of inorganic compounds containing tellurium in oxidations states ranging from –II to VI have been made. The chemical shift tensors of Te(OH)6, TeCl4, TeO2 and elemental tellurium have been determined by simulation of magic angle spinning (MAS) NMR spectra. Binary transition-metal ditellur…
The measurements of time dependencies of dielectrics and structural properties of Na0,5Bi0,5TiO3 have been performed. The results of this investigations confirm the prior data, that phase transition in Na0,5Bi0,5TiO3 from tetragonal to rhombohedral phase takes place in wide temperature range, in which both phases coex…
Abstract The specific surface areas of nine argentinian soils obtained by adsorption followed the order N 2 < ethylene glycol < H 2 O, attributed to the presence of smectites (verified by XRD analysis) and some organic coating. The H 2 O 2 treatment of these soils modified the former order of surface area determ…
In this paper we describe a new instrument for real-time measurements of space charge distributions in insulators submitted to rapidly varying voltages. It is illustrated with the pressure wave propagation method but can also be adapted for use with the pulsed electro-acoustic method. A new acoustic generator has been…
A variety of disubstituted diphenylacetylenes and related compounds have been synthesized by a modified Horner–Emmons reaction, and their second harmonic generation (SHG) has been evaluated by the Kurtz powder method. The diphenylacetylenes with weak electron-donating and -withdrawing groups are found to be efficient…
Extracts of nineteen plant species from an inventory of Nigerian medicinal plants were screened for activity in two in vitro anti-inflammatory model test systems, inhibition of prostaglandin biosynthesis and PAF-induced elastase release from neutrophilis. Anacardium occidentale and Acalipha hispida were active in both…
A comparison is made of the ‘‘apparent viscosity’’ (as defined by Stokes law) between two different cases of a test sphere moving slowly through an unbounded, otherwise quiescent, globally homogeneous, dilute suspension of identical, neutrally buoyant spherical particles dispersed in an incompressible Newtonian liquid…
The competition concept states that stress corrosion cracking (SCC) can only occur when the crack growth rate exceeds the dissolution rate; moreover, based upon this concept, that there also exist a critical temperature for SCC of austenitic stainless steels in chloride solutions which SCC can not occur at or below th…
A computer-aided testing program for electrical apparatus (CATEA) is designed to test the performance of single and polyphase electrical devices. It has been applied to measure the losses of single- and three-phase AC and DC electrical machines, single- and three-phase transformers with linear and nonlinear loads. On-…
Chiroptical absorption and luminescence spectra are reported for a novel Os(II)−polypyridyl complex in which Os(II) is coordinated to one achiral bidentate ligand and a chiral quadridentate ligand. The achiral ligand is 4,4‘-dimethyl-2,2‘-bipyridine (DMbpy), and the chiral ligand is a bisbipyridine-type molecule forme…
Spirality arising from loop distortion in single-jersey knitted fabrics is discussed. Test methods for measuring fabric spirality in knitted fabrics are outlined. Results of an experimental investigation are statistically analyzed considering the effects of yarn/fabric construction factors on the spirality behavior of…
In order to clarify how the internal crack initiation site distributes according to microstructure in high-cycle fatigue, α-β or near α titanium alloys with various microstructure were subjected to fatigue test in liquid nitrogen. The internal crack initiation occurred longer than 105 cycles at 77 K. The initiation si…
Diffusion along grain boundaries (GBs) often controls the evolution of structure and properties of engineering materials at elevated temperatures. A knowledge of diffusion characteristics of GBs and deep fundamental understanding of this phenomenon are critical to many materials applications. The purpose of the presen…
Today's SOFC membrane electrolyte assemblies produced within the Siemens SOFC development program and tested in mixtures of water vapor with hydrogen or methane show a long-term degradation of 20μV/h. This is still 10 times the rate required for a commercial application. As optical and electron micrographs of aged cel…
The heats of decomposition of γ-AgMg 4 and e'-Ag 17 Mg 54 have been measured as 1800 ± 200 Jmol -1 for the peritectoid reaction γ → (Mg) + e' at 469°C and 19 ± 1 kJmol -1 for the peritectic reaction e' → β' + Liq at 491°C. A thermodynamic assessment of phase data for the full range of the Ag-Mg binary alloy system rep…
Heteronuclear complexes of Ln[FexCo1-x(CN)6]⋅4H2O (Ln=Pr-Yb) were synthesized and their thermal decomposition products were investigated. Thermal decomposition of the complexes results in the formation of perovskite-type oxides for Ln=Pr-Gd even at 800°C. The lattice parameters, a-, b- and c-lattice constants (crystal…